Black Bull ISOCKET3 Black Bull 1/2" Drive Wheel Protector Deep Impact Socket Set (3 Piece) Color-coded metric socket sizes: red - 21mm, yellow - 19 and blue - 17mm 1/2 in. deep impact socket set, suitable for use with impact tools Exterior protective sleeve and coated interior 6-point socket helps to limit damage to alloy wheels and nuts Arrives packaged in durable storage case Constructed of chrome moly allow steel, that has been hardened, tempered and anodized to resist corrosion